Improved Photo-Carrier Transfer by an Internal Electric Field in BiOBr/Nrich C3N5 3D/2D S-Scheme Heterojunction for Efficiently Photocatalytic Micropollutant Removal
Changjun You , Chunchun Wang , Mingjie Cai , Yanping Liu , Baikang Zhu , Shijie Li
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Abstract
Photocatalytic wastewater decontamination techniques hold eminent promise in mitigating environmental deterioration, yet the lack of distinctive photocatalysts prevents their further large-scale application. Herein, an S-scheme heterojunction photocatalyst BiOBr/C3N5 (BBN) was fabricated for efficiently dislodging micropollutants under visible light. Among the BBN samples, the optimal BBN-2 demonstrated exceptional activity in photocatalytic TC removal with a rate constant of 0.0139 min‒1, which surpassed that of pure BiOBr and C3N5 by 0.6 and 2.8 times, respectively. The spatially segregated photoredox sites and efficient photo-carrier separation propelled by an internal electric field are found to play a cardinal role in promoting photoreaction kinetics. Moreover, BBN-2 exhibited remarkable resistance to environmental interference and stability, retaining a high activity level after five runs. Through active radical detection, •O2‒, h+ and •OH were identified as the primary active species in the photocatalytic reaction process. This research would encourage the exploration of C3N5-based photocatalysts for environmental protection.
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